--- a/xpcom/base/CycleCollectedJSRuntime.cpp
+++ b/xpcom/base/CycleCollectedJSRuntime.cpp
@@ -54,16 +54,17 @@
 // To improve debugging, if WantAllTraces() is true all JS objects are
 // traversed.
 
 #include "mozilla/CycleCollectedJSRuntime.h"
 #include <algorithm>
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/MemoryReporting.h"
+#include "mozilla/Snprintf.h"
 #include "mozilla/Telemetry.h"
 #include "mozilla/DebuggerOnGCRunnable.h"
 #include "mozilla/dom/DOMJSClass.h"
 #include "mozilla/dom/Promise.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "jsprf.h"
 #include "js/Debug.h"
 #include "nsCycleCollectionNoteRootCallback.h"
@@ -514,26 +515,25 @@ CycleCollectedJSRuntime::DescribeGCThing
     } else if (js::IsFunctionObject(obj)) {
       JSFunction* fun = JS_GetObjectFunction(obj);
       JSString* str = JS_GetFunctionDisplayId(fun);
       if (str) {
         JSFlatString* flat = JS_ASSERT_STRING_IS_FLAT(str);
         nsAutoString chars;
         AssignJSFlatString(chars, flat);
         NS_ConvertUTF16toUTF8 fname(chars);
-        JS_snprintf(name, sizeof(name),
-                    "JS Object (Function - %s)", fname.get());
+        snprintf_literal(name, "JS Object (Function - %s)", fname.get());
       } else {
-        JS_snprintf(name, sizeof(name), "JS Object (Function)");
+        snprintf_literal(name, "JS Object (Function)");
       }
     } else {
-      JS_snprintf(name, sizeof(name), "JS Object (%s)", clasp->name);
+      snprintf_literal(name, "JS Object (%s)", clasp->name);
     }
   } else {
-    JS_snprintf(name, sizeof(name), "JS %s", JS::GCTraceKindToAscii(aThing.kind()));
+    snprintf_literal(name, "JS %s", JS::GCTraceKindToAscii(aThing.kind()));
   }
 
   // Disable printing global for objects while we figure out ObjShrink fallout.
   aCb.DescribeGCedNode(aIsMarked, name, compartmentAddress);
 }
 
 void
 CycleCollectedJSRuntime::NoteGCThingJSChildren(JS::GCCellPtr aThing,